Encoded Stages 1-6 of the Initial D series into high quality MKV h.264 format with English, and Japanese audio, along with English Subtitles as well.
Encoded the Initial D - Extra Stages 1 & 2 OVA into high quality MKV h.264 format with both English and Japanese audio, along with English Subtitles as well.
Encoded the Initial D - Battle Stages 1 & 2 OVA into high quality MKV h.264 format with Japanese audio, and with English Subtitles as well.

Stages 3, 5, and Final are 576p Blu-Ray downscales. Stages 5 and Final were never dubbed, so those only have Japanese audio with English subtitles.
Extra Stage 2 is a Blu-Ray downscale because it had a tad bit more detail than the DVD and was sharper. Extra Stage 2 was never dubbed, so it only has Japanese audio with English subtitles.

For playback all you need is the proper codec or media player if you don’t already have it.
Combined Community Codec Pack or the K-Lite Codec pack should give you all you need and more to play these back.
If you do not wish to install a codec pack, a modern Media Player such as MPC-HC or VLC Media Player should come bundled with everything you need.